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Finding the Fourth Proportional to 214.29, 321.43 and 98.70

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Solution

The fourth proportional to 214.29, 321.43 and 98.70 is: 148.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    214.29 : 321.43 = 98.70 : x
  2. Step 2: Convert to fraction form
    214.29/321.43 = 98.70/x
  3. Step 3: Cross multiply
    214.29x = 321.43 × 98.70
  4. Step 4: Simplify right side
    214.29x = 31,724.06
  5. Step 5: Solve for x
    x = 31,724.06/214.29
  6. Step 6: Final answer
    x = 148.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.